# Wrong experiment Launches When Piloting Study on Pavlovia

**URL:** <https://discourse.psychopy.org/t/wrong-experiment-launches-when-piloting-study-on-pavlovia/45089>\
**Category:** Online experiments\
**Created:** [June 20, 2025, 4:46pm UTC](https://discourse.psychopy.org/t/wrong-experiment-launches-when-piloting-study-on-pavlovia/45089 "2025-06-20T16:46:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![javiers](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/javiers/32/45330_2.png) [@javiers](https://discourse.psychopy.org/u/javiers)\
**Post date:** [June 20, 2025, 4:46pm UTC](https://discourse.psychopy.org/t/wrong-experiment-launches-when-piloting-study-on-pavlovia/45089/1 "2025-06-20T16:46:08Z")

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Hi everyone,

I’m running into an issue when I try to **pilot my study on Pavlovia**.

I have **two experiments in the same PsychoPy project folder** :

- One created using **Coder** (the one I want to run),
- One created using **Builder**.

When I run the Coder experiment **locally in PsychoPy** , it works as expected. But when I **link the project to Pavlovia and click “Pilot”** , it **loads the Builder experiment instead**.

Does anyone know how to **tell Pavlovia which script to pilot** , or how to resolve this conflict between two experiments in the same folder?

Thanks in advance for your help!

Heres the experiment URL: [Pavlovia](https://pavlovia.org/javiers/last_attempt)  
And the experiment itself:  
[Visual Flash Experiment\_lastrun.py](https://discourse.psychopy.org/uploads/short-url/cGcfcDQUnnxkArCNihaE4hLSTl5.py) (260.0 KB)

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**Author:** ![wakecarter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/wakecarter/32/5753_2.png) [@wakecarter](https://discourse.psychopy.org/u/wakecarter)\
**Post date:** [June 20, 2025, 5:31pm UTC](https://discourse.psychopy.org/t/wrong-experiment-launches-when-piloting-study-on-pavlovia/45089/2 "2025-06-20T17:31:15Z")

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Sorry, you can’t run a coder experiment online.

> [@Wakefield's Daily Tips](https://discourse.psychopy.org/t/wakefields-daily-tips/43371/19):
>
> Builder isn’t Coder I strongly discourage the use of PsychoPy Coder for the creation of psychology experiments because Builder is easier to debug, share with others and translate into PsychoJS for use online. If you already have an experiment written in Coder, pasting the code into Builder code components is not sufficient to turn it into a Builder experiment. The logic of how to arrange an experiment is slightly different because of the way Builder works with components, routines and loops. F…